In a Facebook statement, Underoath said Taylor -- who co-founded the group in Ocala in 1997 -- "had to be air-lifted to the hospital and is currently in the ICU" at a Gainesville hospital following the accident in Morriston, just outside Ocala, on Tuesday.

His brother Rhett Taylorwrote on Facebook Tuesday evening that "he was in a serious 4 wheeler accident at our house wearing no helmet and hit a sign. It doesn't look very good." A few hours later, Rhett wrote that while Dallas was still unconscious, and suffering from "tons of broken stuff, lacerations, internal bleeding and head injuries ... it looks like he'll pull through."

On Wednesday, Taylor's current band, Maylene and the Sons of Disaster, wrote that "Dallas is making basic touch responses like hand squeezing and slight movement. He is not awake, but is showing signs of improvement." He suffered multiple broken bones in his arm, the band wrote, and was to undergo surgery on Wednesday. The Ocala Star-Bannerreported that his injuries include a brain bleed and clot in his carotid artery.

Following the accident, Taylor's friends have created a GoFundMe campaign to raise money for his medical bills, as "he will be out of work and in the hospital for an unspecified amount of time. He will have a long painful recovery ahead of him and a massive pile of medical bills."

Taylor left Underoath in 2003, after they had found some fame but before they released their most critically and commercially successful albums, They're Only Chasing Safety (2004), Define the Great Line (2006) and Lost in the Sound of Separation (2008), which made them superstars of Christian metal and earned them two Grammy nominations.

After a three-year hiatus, Underoath in March reunited its mid-2000s lineup -- not including Taylor -- for a largely sold-out reunion tour that kicked off at Jannus Live in St. Petersburg.